CVE-2023-4966

CVE Enrichment

CVSS: 7.5 HIGH
EPSS: 100.00%
EPSS Percentile: 100.00%
CISA KEV: YES — Known Exploited Vulnerability

Description

Sensitive information disclosure in NetScaler ADC and NetScaler Gateway when configured as a Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) or AAA virtual server.

Technical Details

CVSS Version: 3.1
CNA / NVD Source: secure@citrix.com
Published: 10-Oct-2023 21:15
Last Modified: 31-Jul-2026 11:16
EPSS Date: 2026-10-13
CWE: CWE-119

CVSS Vector


            CVSS:3.1                            AV:N /
                            AC:L /
                            PR:N /
                            UI:N /
                            S:U /
                            C:H /
                            I:N /
                            A:N

CISA KEV Details

Date Added: 2023-10-18
Remediation Due: 2023-11-08
Known Ransomware Campaign Use: Known
Required Action: Apply mitigations and kill all active and persistent sessions per vendor instructions [https://www.netscaler.com/blog/news/cve-2023-4966-critical-security-update-now-available-for-netscaler-adc-and-netscaler-gateway/] OR discontinue use of the product if mitigations are unavailable.
Notes: https://www.netscaler.com/blog/news/cve-2023-4966-critical-security-update-now-available-for-netscaler-adc-and-netscaler-gateway/, https://support.citrix.com/article/CTX579459/netscaler-adc-and-netscaler-gateway-security-bulletin-for-cve20234966-and-cve20234967 ; https://nvd.nist.gov/vuln/detail/CVE-2023-4966

Affected Products / Versions

citrix / netscaler_application_delivery_controller
Version / affected range: * · from (inclusive) 12.1 · before (exclusive) 12.1-55.300
cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:fips:*:*:*
citrix / netscaler_application_delivery_controller
Version / affected range: * · from (inclusive) 12.1 · before (exclusive) 12.1-55.300
cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:ndcpp:*:*:*
citrix / netscaler_application_delivery_controller
Version / affected range: * · from (inclusive) 13.0 · before (exclusive) 13.0-92.19
cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:-:*:*:*
citrix / netscaler_application_delivery_controller
Version / affected range: * · from (inclusive) 13.1 · before (exclusive) 13.1-37.164
cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:fips:*:*:*
citrix / netscaler_application_delivery_controller
Version / affected range: * · from (inclusive) 13.1 · before (exclusive) 13.1-49.15
cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:-:*:*:*
citrix / netscaler_application_delivery_controller
Version / affected range: * · from (inclusive) 14.1 · before (exclusive) 14.1-8.50
cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:-:*:*:*
citrix / netscaler_gateway
Version / affected range: * · from (inclusive) 13.0 · before (exclusive) 13.0-92.19
cpe:2.3:a:citrix:netscaler_gateway:*:*:*:*:*:*:*:*
citrix / netscaler_gateway
Version / affected range: * · from (inclusive) 13.1 · before (exclusive) 13.1-49.15
cpe:2.3:a:citrix:netscaler_gateway:*:*:*:*:*:*:*:*
citrix / netscaler_gateway
Version / affected range: * · from (inclusive) 14.1 · before (exclusive) 14.1-8.50
cpe:2.3:a:citrix:netscaler_gateway:*:*:*:*:*:*:*:*

References

Last enrichment sync: 14-Oct-2026 10:27
Sources: NVD · FIRST EPSS · CISA KEV
Latest successful provider update; providers refresh independently.

Reported Context (1)

CVE-2025-5777, nicknamed "CitrixBleed 2" in the spirit of the original 2023 CitrixBleed (CVE-2023-4966) is a memory-overread in NetScaler ADC and Gateway when configured as a Gateway or AAA virtual server. The flaw is Huntress Details CitrixBleed 2 Intrusions Leading to DragonForce Ransomware

CVE (2)

Malware (1)

People (3)

Threat Actors (1)

MITRE ATT&CK (12)

Vendors (1)

Products (6)

Tools (3)

Note: Related entities, including threat actors, malware, CVEs, MITRE ATT&CK techniques, vendors, products, tools, countries, and industries, are shown when they appear in the same reporting. Their presence does not necessarily mean they were targeted, compromised, vulnerable, responsible for the activity, or directly involved in the incident.